Doctor Who Card Game: Twelfth Doctor Expansion - Rules of Play says:

Doctor Who The Card Game: Twelfth Doctor Expansion contains 42 new cards from the Twelfth Doctor's adventures, from Madame Vastra and Strax to Missy and the Boneless. It also contains all the rules, components, counters and cards you need to add and extra player to your game, so 5 players can now adventure through time and space!